Daniel Jalkut
@mjtsai The Time Machine "low priority" thing is interesting. At first blush, I think it affects restore, too? It’s always IMPOSSIBLY slow…
@mjtsai I always assumed it was a network latency thing, but it appears it was far more about the damned CPU priority. Ugh!
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@danielpunkass Nope, Time Machine has always been much slower for local backups, too. - View other replies
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@mjtsai@danielpunkass I believe it's intentional, so actions after OS X updates remain responsive. Also affects Spotlight, cache rebuilding - View other replies
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@danielpunkass@mjtsai CPU isn't throttled. The bottleneck is disk I/O. (lowpri_throttle_enabled is an I/O throttle, not a CPU throttle) -
@danielpunkass@mjtsai You can independently confirm it's an I/O throttle by looking at the source that uses it, http://www.opensource.apple.com/source/xnu/xnu-2422.1.72/bsd/miscfs/specfs/spec_vnops.c?txt … -
@danielpunkass@mjtsai Throttling disk I/O has a side effect of lowering CPU use by reducing working set. But that's not the main goal. -
@danielpunkass@mjtsai There are even different throttles used depending on if the device is seen as an SSD or not an SSD by the system! -
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Michael Tsai
Rosyna Keller
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